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Refrigerant P/T Chart · Free Tool

Refrigerant
Pressure-Temperature Chart

Interactive P/T lookup for R-410A, R-22, R-32, R-454B, R-134a, and R-404A. Enter pressure or temperature to find the corresponding value instantly.

Refrigerant Pressure-Temperature Relationship

Every HVAC technician needs to know the pressure-temperature relationship of the refrigerant they're working with. This relationship is fundamental to diagnosing charge levels, verifying subcooling and superheat, and identifying system problems.

How to Use a P/T Chart

Connect your gauges to the service ports. Read the high-side (liquid line) and low-side (suction line) pressures. Use this chart to find the corresponding saturation temperature. Compare that to the actual line temperature measured with a thermometer to calculate subcooling or superheat.

R-410A vs R-22

R-410A operates at roughly 60% higher pressures than R-22. At 45°F evaporator temperature, R-22 runs about 76 PSIG while R-410A runs about 128 PSIG. This is why R-410A systems require different components rated for higher pressures, including capacitors, contactors, and service valves.

New Refrigerants: R-32 and R-454B

As the industry transitions away from R-410A, R-32 and R-454B are becoming the standard for new equipment. Both have lower GWP (Global Warming Potential). R-454B is the direct R-410A replacement used by Carrier, while R-32 is used by Daikin and others. This chart includes both for field reference.

Frequently Asked Questions

What pressure should R-410A be at 75°F?
At 75°F outdoor ambient, R-410A high-side pressure is typically 350-400 PSIG and low-side is 118-128 PSIG, depending on conditions. The saturation pressure at 75°F is approximately 217 PSIG.
What is the difference between bubble and dew point?
For zeotropic blends (like R-407C), bubble point is the temperature where the first vapor bubble forms (used for liquid line/subcooling), and dew point is where the last liquid drop evaporates (used for suction line/superheat). For near-azeotropic blends like R-410A, the difference is negligible.
Can I use R-410A gauges for R-454B?
R-454B operates at slightly lower pressures than R-410A, so R-410A rated gauges and hoses will work. However, R-454B is mildly flammable (A2L), so you need leak detectors rated for A2L refrigerants and must follow updated safety procedures.

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